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Transmission Control Module (TCM) - NAG1






P0710-TRANSMISSION TEMPERATURE SENSOR CIRCUIT





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Electrohydraulic Control Unit Assembly of the NAG1 transmission contains a temperature sensor to monitor the transmission oil temperature. This sensor is wired in series with the transmission Park/Neutral switch. The Transmission Control Module (TCM) expects to see a valid voltage level from the sensor when the shifter is in Reverse or any forward Drive position. The TCM also expects to see an open circuit condition when the shifter is in the Park or Neutral position. When the controller detects an open circuit when in Reverse or any forward drive position the DTC will set. Note: Due to a open circuit condition in Park or Neutral, the TCM substitutes the Transmission Temperature reading with Engine Temperature when in Park or Neutral

- When Monitored:
Continuously with the ignition on.

- Set Condition:
When the TCM detects an open circuit when in Reverse or any forward drive position the DTC will set.





Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. NAG1 Pre-Diagnostic Troubleshooting Procedure

1. CHECK IF SPEED SENSOR DTCS ARE PRESENT
1. With the scan tool, read Transmission DTCs.

Are there any speed sensor DTCs present also?

Yes

- Perform the appropriate diagnostics.

No

- Go To 2

2. CHECK IF SHIFT LEVER ASSEMBLY SHIFT CABLE IS OUT OF ADJUSTMENT
1. Check the Shift Lever Assembly shift cable for proper adjustment.

Is the Shift Lever Assembly shift cable properly adjusted?

Yes

- Go To 3

No

- Adjust the Shift Lever Assembly shift cable.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test

3. CHECK IF ENGINE STARTS IN PART OR NEUTRAL
1. Attempt to start the engine in Park or Neutral.

Does the engine start in either Park or Neutral?

Yes

- Go To 4

No

- Go To 5

4. TRANSMISSION TEMPERATURE SENSOR-P/N SWITCH




1. Turn the ignition off to the lock position.
2. Disconnect the TCM C2 harness connector.
3. Place the gear selector in Drive.
4. Measure the resistance of the Transmission Temperature Sensor between the (T54) Temperature Sensor-P/N Switch Signal circuit and the (T13) Sensor Ground circuit in the TCM C2 harness connector.

Is the resistance between 500 to 2500 ohms?

Yes

- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test

No

- Using the schematics as a guide, check the Electrohydraulic Control Unit Assembly and Transmission Temperature Sensor-P/N Switch pins and connector terminals for corrosion, damage, or terminal push out. If no problems are found, replace the Transmission Temperature Sensor-P/N Switch.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test

5. CHECK THE TRANSMISSION TEMPERATURE SENSOR-P/N SWITCH
1. Turn the ignition off to the lock position.
2. Reconnect the TCM C2 harness connector.
3. Disconnect the Electrohydraulic Control Unit Assembly harness connector.

NOTE: This procedure may set various DTCs to multiple modules connected to the CAN bus. Disregard and erase any DTCs that may set after completion of this procedure.

4. With the Shift Lever in the Park position, attempt to start the engine.

Does the engine start?

Yes

- Replace the Transmission Temperature Sensor-P/N Switch.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test

No

- Go To 6

6. CHECK IF THE (T54) TEMPERATURE SENSOR-P/N SWITCH SIGNAL CIRCUIT IS SHORTED TO GROUND




1. Turn the ignition off to the lock position.
2. Reconnect the Electrohydraulic Control Unit Assembly harness connector.
3. Disconnect the TCM C1 and C2 harness connectors.
4. Measure the resistance between ground and the (T54) Temperature Sensor-P/N Switch Signal circuit.

Is the resistance below 5.0 ohms?

Yes

- Repair the (T54) Temperature Sensor-P/N Switch Signal circuit for a short to ground.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test

No

- Go To 7

7. CHECK IF (T54) TEMPERATURE SENSOR-P/N SWITCH SIGNAL CIRCUIT IS SHORTED TO ANOTHER CIRCUIT(S)




1. Measure the resistance between the (T54) Temperature Sensor-P/N Switch Signal circuit and all other circuits in the TCM C1 and C2 harness connectors.

Is the resistance below 5.0 ohms between the (T54) Temperature Sensor-P/N Switch Signal circuit and any other circuit(s)?

Yes

- Repair the (T54) Temperature Sensor-P/N Switch Signal circuit for a short to another circuit(s).
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test

No

- Using the schematics as a guide, check the Transmission Control Module (TCM) terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. If no problems are found, replace and program the TCM.
- Perform NAG1 TRANSMISSION VERIFICATION TEST. NAG1 Transmission Verification Test

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